TY - GEN AU - Pardo Espino, Enrique A4 - Matemáticas PY - 1996 SN - 0092-7872 UR - http://hdl.handle.net/10498/16079 AB - There are several long-standing open problems which ask whether regular rings, and C -algebras of real rank zero, satisfy certain module cancellation properties. Ara, Goodearl, O'Meara and Pardo recently observed that both types of rings are... LA - eng TI - Comparability, Separativity, and exchange rings DO - 10.1080/00927879608825721 ER -